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polycrystalline

[pol-ee-kris-tl-in, -ahyn, -een]
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adjective
  1. (of a rock or metal) composed of aggregates of individual crystals.
  2. having or consisting of crystals that are variously oriented.
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Origin of polycrystalline

First recorded in 1920–25; poly- + crystalline
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018